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Step7_300 - 1 Siemens Step 7 S7-300 Programming Copyright ©2007-11, Dogwood Valley Press, LLC. SiemensStep7_S7_300.doc Step7_300 - 1 Table of Contents Page A. Starting a Project With the S7-300 Step7_300–3 1. Configuring Communications Step7_300–3 2. I/O Configuration Step7_300–4 3. Specifying Other Variables Step7_300–5 4. Processor Download Step7_300–5 B. Ladder Logic Programming Step7_300–7 1. Two Contacts in Series (Logical AND) Step7_300–7 2. Entering Branches (Logical OR) Step7_300–8 3. Timers Step7_300–8 4. Counters Step7_300–9 C. Adding Comments to Ladder Logic Step7_300–10 D. Assigning Symbols to Addresses Step7_300–10 E. Displaying Memory Locations Step7_300–11 F. Input/Output Forcing Step7_300–11 G. Importing/Exporting Symbols Step7_300–12 H. Saving Ladder Logic Program Step7_300–13 I. Restoring Ladder Logic Program Step7_300–13 J. Printing Ladder Logic Program Step7_300–14 Copyright ©2007-11, Dogwood Valley Press, LLC. SiemensStep7_S7_300.doc Step7_300 - 2 This document is a supplement to the “Lab 1.doc” lab exercise that introduces one to the basics of ladder logic programming. The following equipment is assumed: Siemens 6ES7 307-1EA00-0AA0 PS307 10A power supply Siemens 6ES7 316-2AG00-0AB0 CPU316-2 DP processor Siemens 6ES7 321-1BL00 32 chan. 24v disc. input Siemens 6ES7 322-1BH01 16 chan. 24v disc. out/0.5A This document is primarily for version 5.4 of the Step7 software. A MPI/DP PC adapter (6ES7 972-0CA23-0XA0) plus serial cable connection from the PC to the processor is also assumed. In order to become familiar with basic ladder logic programming and addressing techniques on the Siemens equipment, the steps to accomplish the first part of the first lab exercise are outlined in sections A and B. The remainder of the sections outline the steps to document your ladder, to print the ladder logic program, and to save your ladder logic diagram. In an industrial setting, the initial PLC programming is done offline and then later downloaded to the PLC when ready for the final test and debug. In addition, there is usually only one project (program) for each PLC on the network. For these labs, the ladder programming will be done online so that changes can be immediately tested. Siemens Step 7 version 5.4 is used to program the S7-300 and S7-400 PLCs. An icon for these programs should already be on the desktop. The PLC and the PC used to program it are connected directly through a serial RS-232 link. Copyright ©2007-11, Dogwood Valley Press, LLC. SiemensStep7_S7_300.doc
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